<?php

if (!defined('BASEPATH'))
  exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright	Copyright (c) 2008 - 2011, EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */
// ------------------------------------------------------------------------

/**
 * Initialize the database
 *
 * @category	Database
 * @author		ExpressionEngine Dev Team
 * @link		http://codeigniter.com/user_guide/database/
 * @param 	string
 * @param 	bool	Determines if active record should be used or not
 */
function &DB($params = '', $active_record_override = NULL) {
  // Load the DB config file if a DSN string wasn't passed
  if (is_string($params) AND strpos($params, '://') === FALSE) {
    // Is the config file in the environment folder?
    if (!defined('ENVIRONMENT') OR ! file_exists($file_path = APPPATH . 'config/' . ENVIRONMENT . '/database.php')) {
      if (!file_exists($file_path = APPPATH . 'config/database.php')) {
        show_error('The configuration file database.php does not exist.');
      }
    }

    include($file_path);

    if (!isset($db) OR count($db) == 0) {
      show_error('No database connection settings were found in the database config file.');
    }

    if ($params != '') {
      $active_group = $params;
    }

    if (!isset($active_group) OR ! isset($db[$active_group])) {
      show_error('You have specified an invalid database connection group.');
    }

    $params = $db[$active_group];
  } elseif (is_string($params)) {

    /* parse the URL from the DSN string
     *  Database settings can be passed as discreet
     *  parameters or as a data source name in the first
     *  parameter. DSNs must have this prototype:
     *  $dsn = 'driver://username:password@hostname/database';
     */

    if (($dns = @parse_url($params)) === FALSE) {
      show_error('Invalid DB Connection String');
    }

    $params = array(
        'dbdriver' => $dns['scheme'],
        'hostname' => (isset($dns['host'])) ? rawurldecode($dns['host']) : '',
        'username' => (isset($dns['user'])) ? rawurldecode($dns['user']) : '',
        'password' => (isset($dns['pass'])) ? rawurldecode($dns['pass']) : '',
        'database' => (isset($dns['path'])) ? rawurldecode(substr($dns['path'], 1)) : ''
    );

    // were additional config items set?
    if (isset($dns['query'])) {
      parse_str($dns['query'], $extra);

      foreach ($extra as $key => $val) {
        // booleans please
        if (strtoupper($val) == "TRUE") {
          $val = TRUE;
        } elseif (strtoupper($val) == "FALSE") {
          $val = FALSE;
        }

        $params[$key] = $val;
      }
    }
  }

  // No DB specified yet?  Beat them senseless...
  if (!isset($params['dbdriver']) OR $params['dbdriver'] == '') {
    show_error('You have not selected a database type to connect to.');
  }

  // Load the DB classes.  Note: Since the active record class is optional
  // we need to dynamically create a class that extends proper parent class
  // based on whether we're using the active record class or not.
  // Kudos to Paul for discovering this clever use of eval()

  if ($active_record_override !== NULL) {
    $active_record = $active_record_override;
  }

  require_once(BASEPATH . 'database/DB_driver.php');

  if (!isset($active_record) OR $active_record == TRUE) {
    require_once(BASEPATH . 'database/DB_active_rec.php');

    if (!class_exists('CI_DB')) {
      eval('class CI_DB extends CI_DB_active_record { }');
    }
  } else {
    if (!class_exists('CI_DB')) {
      eval('class CI_DB extends CI_DB_driver { }');
    }
  }

  require_once(BASEPATH . 'database/drivers/' . $params['dbdriver'] . '/' . $params['dbdriver'] . '_driver.php');

  // Instantiate the DB adapter
  $driver = 'CI_DB_' . $params['dbdriver'] . '_driver';
  $DB = new $driver($params);

  if ($DB->autoinit == TRUE) {
    $DB->initialize();
  }

  if (isset($params['stricton']) && $params['stricton'] == TRUE) {
    $DB->query('SET SESSION sql_mode="STRICT_ALL_TABLES"');
  }

  return $DB;
}

/* End of file DB.php */
/* Location: ./system/database/DB.php */